Jǐngchá de huǒyǎnjīnjīng hěn kuài shípò le piànzi de jìliǎng.
The officer's piercing eye quickly saw through the con artist's tricks.
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The phrase belongs to Sun Wukong (孙悟空), the Monkey King. In 《西游记》 he was roasted in Laozi's furnace for 49 days, giving him the 火眼金睛 that sees demons in any disguise. Using it implies that level of uncanny, demon-busting perception.